[Midnightbsd-cvs] src [7797] trunk/sys/amd64/amd64/pmap.c: enable new instructions for reading and writing bases.

[laffer1 at midnightbsd.org]

Revision: 7797
          http://svnweb.midnightbsd.org/src/?rev=7797
Author:   laffer1
Date:     2016-09-05 15:22:47 -0400 (Mon, 05 Sep 2016)
Log Message:
-----------
enable new instructions for reading and writing bases. This was already partially applied

Modified Paths:
--------------
    trunk/sys/amd64/amd64/pmap.c

Modified: trunk/sys/amd64/amd64/pmap.c
===================================================================
--- trunk/sys/amd64/amd64/pmap.c	2016-09-05 17:05:41 UTC (rev 7796)
+++ trunk/sys/amd64/amd64/pmap.c	2016-09-05 19:22:47 UTC (rev 7797)
@@ -584,6 +584,8 @@
 	/* XXX do %cr0 as well */
 	load_cr4(rcr4() | CR4_PGE | CR4_PSE);
 	load_cr3(KPML4phys);
+	if (cpu_stdext_feature & CPUID_STDEXT_SMEP)
+		load_cr4(rcr4() | CR4_SMEP);
 
 	/*
 	 * Initialize the kernel pmap (which is statically allocated).